package servlets;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet Filter implementation class LoginFilter
 */
@WebFilter("/LoginFilter")
public class LoginFilter implements Filter {

    /**
     * Default constructor. 
     */
    public LoginFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		 HttpServletRequest httpServletRequest = (HttpServletRequest) request;
		 HttpServletResponse httpServletResponse = (HttpServletResponse) response;
		 if(httpServletRequest.getMethod().equalsIgnoreCase("POST") &&
				 ServletsUtil.getUserID(httpServletRequest) == -1 ){
			 httpServletResponse.sendError(HttpServletResponse.SC_UNAUTHORIZED);
		 }else{
			// pass the request along the filter chain
				chain.doFilter(request, response);
	}
	}
	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
